What is the maximum RPM of the APU?

The maximum RPM of the Auxiliary Power Unit (APU) is 106%. This means that the APU can operate at up to 106% of its nominal rated RPM, indicating the upper limit of its functioning capability under normal conditions. Operating at this RPM allows the APU to produce the necessary electrical power and bleed air for aircraft systems and engines during specific phases of operation, such as ground use before engine start or in case of engine failure.

Understanding the maximum RPM is critical for ensuring the safe and efficient operation of the APU, as exceeding this limit can lead to mechanical failures or damage to the APU. The choices that indicate lower RPM values suggest operational limits that are below the peak efficiency and performance capability of the APU, thus making them incorrect in this context.